Recursivly Deleted Root Directory [duplicate]

I recursively deleted the contents of my root directory with sudo privileges. My display reset, and windowing stopped working. I could no longer run non-buitin commands. Most of my directories (including the home directory disappeared).

What I meant to run:

sudo rm ./* -rf

What I believe I ran:

sudo rm /* -rf

I understand how this command works (see What does rm -rf do?).

I'm trying to get a better sense of how much (and what parts) of the original files and directory-structure physically remains on the hard-drive.

How much of these "remains" are recoverable? E.g is it possible to use data recovery software like TestDisk/PhotoRec to recover the full home dir itself? What about config files?

What happened

That can be looked up in the man pages. rm deletes files and with the arguments -r (for recursively) and -f (for "forcefully").

In short it that command deletes every file (and directory) which is a child of that path. In your case /

Usually there should have been a warning about deleting your root directory (--no-preserve-root flag), though as I have never run that command myself (yet) I can't confirm if that happens everywhere.

How can I recover from an rm -rf

Data recovery isnt just running a few commands and be done with it. As the answer below states data recovery is a science.

Usually your best shot (best as in getting the most databack) if in fact everything was deleted is bare-metal recovery, though if it is financially viable is up to you to decide.

See this question over on serverfault for waht next steps to take: https://serverfault.com/questions/587102/monday-morning-mistake-sudo-rm-rf-no-preserve-root